

A213373


Total number of pairs of states of the first n subshells of the nuclear shell model in which the subshells are ordered by energy level in increasing order.


7



1, 3, 4, 7, 8, 10, 14, 16, 19, 20, 25, 29, 32, 38, 40, 41, 45, 50, 57, 59, 62, 63
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OFFSET

1,2


COMMENTS

First differs from A212123 at a(14). For more information see A213372.


LINKS

Table of n, a(n) for n=1..22.
MIT OpenCourseWare, Energy Levels of Nucleons in a SmoothlyVarying Potential Well


FORMULA

a(n) = A213374(n)/2.


EXAMPLE

Written as an irregular triangle in which row j is related to the jth shell of nucleus. Note that row 4 has only one term. Triangle begins:
1;
3, 4;
7, 8, 10;
14;
16, 19, 20, 25;
29, 32, 38, 40, 41;
45, 50, 57, 59, 62, 63;
...


CROSSREFS

Partial sums of A213371. Other versions are A210983, A212013, A212123, A213363.
Cf. A018226, A213372, A213374.
Sequence in context: A210983 A213363 A212123 * A332059 A229081 A070874
Adjacent sequences: A213370 A213371 A213372 * A213374 A213375 A213376


KEYWORD

nonn,tabf,hard,more


AUTHOR

Omar E. Pol, Jul 16 2012


STATUS

approved



